Chapter 2-3 crossword

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Across
  1. 4. when the body’s internal state is balanced.
  2. 5. the part of a nerve that carries electrical impulses to the synapses.
  3. 7. an overreaction by the immune system in response to pollen, dust or other non-pathogens.
  4. 9. a chemical messenger that travels through the blood to target cells.
  5. 10. an involuntary movement in response to stimulus.
Down
  1. 1. a structure that detects a stimulus or change in the normal functioning of the body.
  2. 2. a nerve cell.
  3. 3. an injection of an inactive or artificial pathogen that results in immunity against the pathogen.
  4. 6. a bacteria, virus or fungi that causes negative reactions in the body.
  5. 8. change in the environment that interrupts homeostasis.